Charles Ellicott Commentary 1 Chronicles 12:32

"And of the children of Issachar, men that had understanding of the times, to know what Israel ought to do, the heads of them were two hundred; and all their brethren were at their commandment." — 1 Chronicles 12:32 (ASV)

And of the children of Issachar ... — Rather, And of the sons of Issachar (came) men sage in discernment for the times (tempora, critical junctures) , so as to know what Israel should do; namely, their chiefs two hundred (in number), and all their fellow clansmen under their orders. The old Jewish expositors concluded, from the former part of this verse that the tribe of Issachar had skill in astrology, so that they could read in the heavens what seasons were auspicious for action, as the ancient Babylonians professed to do. But all that the text really asserts is that those men of Issachar who went over to David thereby showed political sagacity. No similar phrase occurs elsewhere in the Old Testament.

At their commandment. — Upon their mouth. (Compare to Numbers 4:27.) The clansmen marched with their chieftains. The total number of Issachar’s contingent is not assigned.